Answer
(e) a natural law
Work Step by Step
The fact that the volume of a fixed amount of gas at a fixed temperature is inversely proportional to the gas pressure is an example of a natural law. A natural law is a generalization about the behavior of the natural world that is derived from empirical observation and is supported by scientific evidence. In this case, the relationship between the volume of a gas and its pressure is a well-established natural law known as Boyle's Law.
The correct answer is (e).